99131897 has 2 divisors, whose sum is σ = 99131898. Its totient is φ = 99131896.

The previous prime is 99131887. The next prime is 99131933. The reversal of 99131897 is 79813199.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54228496 + 44903401 = 7364^2 + 6701^2 .

It is a cyclic number.

It is not a de Polignac number, because 99131897 - 2¹⁰ = 99130873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99131827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49565948 + 49565949.

It is an arithmetic number, because the mean of its divisors is an integer number (49565949).

Almost surely, 2^99131897 is an apocalyptic number.

It is an amenable number.

99131897 is a deficient number, since it is larger than the sum of its proper divisors (1).

99131897 is an equidigital number, since it uses as much as digits as its factorization.

99131897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 99131897 is about 9956.5002385376. The cubic root of 99131897 is about 462.8118522060.

The spelling of 99131897 in words is "ninety-nine million, one hundred thirty-one thousand, eight hundred ninety-seven".